Transmission Control Module - Description

TRANSMISSION CONTROL MODULE - NAG1





The TCM is located under the left side of the instrument panel for left hand drive vehicles. For right hand drive vehicles, the TCM is located in the mirrored location under the right side of the instrument panel.

The electronic control system consists of various components providing inputs to the transmission control module (TCM). The TCM monitors transmission sensors, shift lever position, and bus messages to determine transmission shift strategy. After shift strategies are determined, the TCM controls the actuation of transmission solenoids, which controls the routing of hydraulic fluid within the transmission, by moving a sequence of four valves to make a shift occur.

The NAG1 electronic transmission has a fully adaptive control system. The system performs its functions based on continuous real-time sensor feedback information. In addition the TCM receives information from the PCM (engine management) and ABS (chassis systems) controllers over the CAN bus. The CAN bus is a high-speed communication bus that allows real time control capability between various controllers. Most messages are sent every 20 milliseconds. This means critical information can be shared between the transmission, engine, and ABS controllers. The CAN bus is a two wire bus with a CAN Bus (+) circuit and a CAN Bus (-) circuit. These circuits are twisted pairs in the harness to reduce the potential of radio and noise interference.

The transmission control system automatically adapts to changes in engine performance, vehicle speed, and transmission temperature variations to provide consistent shift quality. The control system ensures that clutch operation during up-shifting and downshifting is more responsive without increased harshness. The TCM activates the solenoid valves and moves valves in the valve body to achieve the necessary gear changes. The required pressure level is calculated from the load condition, engine speed. Vehicle speed (from ABS module) and transmission oil temperature, matched to the torque to be transmitted. The TCM is located under the left side of the instrument panel for left hand drive vehicles. For right hand drive vehicles, the TCM is located in the mirrored location under the right side of the instrument panel.